Merge branch 'bugfix/can_not_get_IP_address_from_China_mobile_v4.0' into 'release/v4.0'

wifi: fix the bug that ESP32 can't get IP address from China Mobile router (v4.0)

See merge request espressif/esp-idf!8401
This commit is contained in:
Jiang Jiang Jian
2020-05-06 11:16:24 +08:00